Realm disconnecting and crashing when specific player joins.

When trying to join a realm, I'm faced with a "Disconnected from Server" message, and the realm (if anyone was active on it) crashes, kicks everyone off, and resets to the last save. This only happens with me, and has been happening across my platforms (iPad, iPhone) for around five days. I've deleted Minecraft and redownloaded, removed the realm from my account and readded it, all to no avail. Attached is a screenshot of my screen as soon as the loading screen plays through. Not even for a second am I able to see the world.